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Vulnerabilities

Vulnerability · CVE-2025-49730

Time-of-check time-of-use (toctou) race condition in Microsoft Windows QoS scheduler allows an authorized attacker to elevate privileges locally.

Published Jul 8, 2025 · catalog updated Feb 13, 2026 · Microsoft Windows Server 2019

Check this week

CVE-2025-49730 is not in CISA KEV. FIRST estimates a 68.00% chance of exploitation in the next 30 days. Check whether you run Microsoft Windows Server 2019.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
68.00%
Remediation
Version ranges on file
Affected products
vendor Microsoft Windows Server 2019 10.0.17763.0 <10.0.17763.7558

Time-of-check time-of-use (toctou) race condition in Microsoft Windows QoS scheduler allows an authorized attacker to elevate privileges locally.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Microsoft Windows Server 2019 10.0.17763.0 <10.0.17763.755810.0.17763.0 <10.0.17763.7558

How to fix CVE-2025-49730

  • Recommended remediation

    Affected version ranges suggest a fixed boundary. Verify against the vendor advisory for your release.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2025-49730 is not in CISA KEV. FIRST estimates a 68.00% chance of exploitation in the next 30 days. Check whether you run Microsoft Windows Server 2019.

Which versions are affected?

Compare what you have installed with Microsoft Windows Server 2019 10.0.17763.0 <10.0.17763.7558 10.0.17763.0 <10.0.17763.7558. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 68.00%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Windows security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jul 8, 2025 · EUVD

    Detected

    Time-of-check time-of-use (toctou) race condition in Microsoft Windows QoS scheduler allows an authorized attacker to elevate privileges locally.

  2. Feb 13, 2026 · EUVD

    Updated

    Time-of-check time-of-use (toctou) race condition in Microsoft Windows QoS scheduler allows an authorized attacker to elevate privileges locally.

Sources

  • EUVDVulnerability recordEUVD-2025-20544

    Time-of-check time-of-use (toctou) race condition in Microsoft Windows QoS scheduler allows an authorized attacker to elevate privileges locally.

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Feb 13, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.